LAmp replacement in passengerside headlight

I have just noticed the wife has a lamp out in the car.I have had a quick look in the dark but doesnt look simple,could anyone point me in the direcion of how i replace the lamp?i have read on other forums that i have to disconnect the battery and remove it to gain access this cannot be correct can it?

I have a 2004 Audi A4 and to replace the lamp in my front headlights i have to remove the full headlight to change the lamp a pian in the butt at first glance but not to bad once i had a digram from a forum i use for that car does anyone have anything simlar for the Focus?
The Focus is a 2005 Titanium model

Don't know how much the light design on the 2005 model differs from my 2003 Focus, but I've recently changed the sidelights & dipped beams on both sides, without having to remove anything other than the plastic covers at the back of the light unit.

The dipped bulbs are held in by a metal clip which hinges into place and clips shut (a bit like closing a gate then latching it) whilst the sidelights just pushed into place. Its a bit of a squeeze & it helps if you've got small hands (like me!), but it can be done without having to bugger about removing the light or the battery, etc....might be useful getting a small mirror first to try & see where everything is before putting your hand in, as you'll have to work "by feel"...